FI87248B - PLUMBING FITTINGS SPECIFICALLY FOER ATT MONTERAS VID SANITETSARMATUR. - Google Patents

Abstract

An anti-syphoning valve (12) which is suitable especially for incorporation into sanitary fittings comprises, in a housing (1), a chamber (10) into which a water inlet conduit (9), a water outlet conduit (8) and a ventilation channel lead. A resilient closing flap (16) comprises a fastening portion (18) and a closing portion (19) connected hinge-like thereto. Normally, that is, provided there is no negative pressure in the inlet conduit, the closing portion covers the opening of the ventilation channel leading into the chamber, so that, on the one hand, no atmospheric air can enter and, on the other hand, no water can escape. If, however, a negative pressure arises in the pipe system connected to the inlet conduit, the closing portion of the closing flap pivots through a certain angle until it seals the inlet point of the conduit leading into the chamber and, on the other hand, frees the ventilation channel to the chamber. In this way, no more water can flow back into the inlet conduit and to the pipe system connected thereto; on the other hand, the water passages downstream of the chamber are ventilated. The sucking back of contaminated water into the drinking-water system which is connected to the inlet conduit is thereby reliably prevented. The anti-siphoning valve is of such small construction that it can be accommodated especially in the bottom region of known sanitary fittings. <IMAGE>

Description

87248

Air valve for sanitary fittings, especially for installation in sanitary fittings

The present invention relates to an air valve for sanitary fittings, 10 intended in particular for installation in a sanitary fitting, comprising: a) a housing; (B) a chamber in the housing leading to: (ba) a water inlet duct; (bb) drainage channel; 20 bc) air duct; c) a shut-off flap in the chamber which is rotatable by a certain angle due to the vacuum in the inlet duct from the first position 25 in which it closes the air duct to the second position in which it closes the inlet duct and opens the air duct.

Sanitary fittings are known to be used, which can endanger the quality of drinking water in connection with the return of sewage. These include bathtub and shower sets specifically equipped with 30 hose arm spray nozzles or wash and flush table fittings with a detachable hose arm spray nozzle. Such fittings must be fitted with safety devices to reliably prevent the absorption of contaminated water back into the drinking water. An air valve is usually used as such a safety device.

An air valve of the type mentioned at the beginning is known from DIN 3266, July 1966, Fig. 2. In this valve, a seat is arranged coaxially with the water inlet chamber in the housing chamber, through which radial flow openings for water are passed. Arranged coaxially with the wall of this seat, an outer wall is provided with openings for air access. The elastic closure member is a hollow cylindrical part 5 located next to the inner seat without water flow and closes the water flow openings and at the same time keeps the air openings free. When there is pressurized water in the inlet duct, the hollow cylindrical closure member protrudes radially outwards so that the water duct leading to the chamber is released and the air supply through the radial air openings is closed.

However, this known air valve ("Bauform A 2", construction type A 2) is so large that it is difficult to install in a sanitary fitting. In addition, it is relatively complex in structure.

The object of the present invention is to provide an air valve of the type mentioned at the beginning so that it can be installed in a small space at low cost and is particularly suitable for installation also in sanitary fittings.

This object is achieved according to the invention in that d) the closure flap is fastened to the housing itself by means of an elastic fastening part formed in one piece; e) that the closing flap (19; 119) is pivotable about a transition line between the fastening part and itself; and f) that the shut-off flap is formed so that when no vacuum is present in the inlet duct, it remains elastically resilient over the mouth of the air duct leading to the chamber.

In this embodiment of the air valve according to the invention, the interior of the chamber housing 35 can be provided with geometrically quite smooth walls. The connection of the duct to the chamber freely corresponds to the method of connecting the sanitary fittings. The need for space is correspondingly small. In contrast, the response sensitivity of the closure part 3 is high, because only small hinge forces are required to turn the closure part, and no elastic expansion is required.

5 When the closing part is located in the inlet duct, resiliently resiliently at the mouth opening leading to the air duct chamber, when the vacuum is not affected, it is prevented that when the jet hose connected to the outlet duct is used, the water therein cannot escape from the air opening.

In a special embodiment of the invention, a groove is provided in the transition line between the fastening part and the pivotable closing part of the closing flap. In this case, the axis around which the pivoting movement of the closing part takes place is precisely determined and the pivoting movement itself is facilitated.

15 The shut-off flap can be made entirely of elastic material; this elasticity thus benefits both hinging and sealing.

Alternatively, the closure portion of the closure flap may be made of a hard material having elastic surfaces on both sides. These elastic surfaces then provide sealing, while reversibility is provided by a specially made hinge.

The closure part can also be made entirely of hard material if the openings leading to the air duct and the inlet duct chamber are surrounded by elastic seals.

Embodiments of the invention will now be illustrated by means of the accompanying drawings, in which: Figure 1 is a side view, partly in cross-section, of a sanitary fitting fitted with an air valve;

Figure 2a is a side view of the shut-off flap in the air valve of Figure 1; Fig. 2b shows the shut-off flap of the air valve of Fig. 1 from below;

Figure 3 shows another embodiment of an air valve to be installed in the sanitary fittings shown in Figure 1.

The sanitary fitting shown in Fig. 1 comprises, in a known manner, a fitting 1, a rotatable and pivotable control lever 2 and a pull-out outlet nozzle 3. The latter is connected to the outlet pipe 5 by a bending hose 4 The outlet pipe 5 is connected to the base part 6, which is supported by the inner shoulder of the armature body 1. The base part 6 supports a guide cone 7, which can be constructed in a known manner and to which the control elements necessary for the control of the water flow or water flows are connected. These control elements are moved by means of the handle 2 in a suitable manner. The two inlet pipes 8 for cold or hot water also extend through the hole in the washbasin 15 and from below into the armature piece. They pass through the base part 6 and are in communication with the guide carriage 7 in a known manner.

Depending on the relative position of the guide elements of the guide carriage 7, the mixing water is passed through a short channel 9 into a slightly enlarged chamber 10 and from there through a channel 11 coaxially to the channel 9, to the outlet pipe 5 and to the outlet nozzle 3.

An air valve, denoted by reference numeral 12, is inserted into the chamber 10 from the side. It comprises a hollow cylindrical insert 13 sealed by O-ring seals against the side wall of the chamber 10 in the base part 6 and against the side wall of the armature body 1. The interior 14 of the hollow cylindrical insert 13 communicates with the external atmosphere through a hole 15.

30

Under normal conditions, i.e. as long as there is no vacuum in the line system connected to the supply lines 8, the interior 14 of the insert 13 is closed up to the interior of the chamber 10 by a shut-off flap 16.

This is shown on an enlarged scale in a side view in Figure 2a and from below in Figure 2b. It consists of an elastic material, preferably rubber or a comparable active ingredient. It comprises a fastening part 18 formed in the side cam 17 (see Fig. 2b), bent at an angle of substantially 90 ° 87248 5, and a circular closing part 19 in the bottom view. A groove 20 runs in the boundary line between the fastening part 18 and the side cam 17, forming a hinge part 18 in this area. and 19.

5

As can be seen in Figure 1, the closure portion 18 of the closure flap 16 is tightened between the outer wall of the insert 13 and the inner wall of the chamber 10, while the closure portion 19 of the closure flap 16 can pivot through the groove formed between the groove 20.

The mode of operation of the described air valve inside the sanitary fitting shown is as follows: 15 Normal operation means a state of the sanitary fitting in which there is no vacuum in the piping system containing the supply pipes 8. Under these conditions, the closure portion 18 of the shut-off flap 16 is under light elastic pressure on the right end of the insert 13 (Fig. 1) and prevents both air from the external atmosphere into the interior of the chamber 10 and 20 from flowing out of the chamber 10 through the air hole 15 in the armature body 1. The latter is especially important when the bend of the shower hose 4 is still full of water. Without the shut-off flap 16 in the insert 13, the water still in the bend of the shower hose would flow out of the air hole 15.

25

If, in an exceptional case, there is a vacuum in the conduit system connected to the supply pipes 8, the closing part 19 of the shut-off flap 16 turns about 90 ° until it closes the channel 9, as shown by the dotted lines in Fig. 1. This firstly prevents water from flowing back to the guide cone 7 and from there possibly even to the supply pipes 8 and the piping system connected to them. Simultaneously, the air flow is released through the air hole of the armature housing 1 and the interior 14 of the insert 13 to the right-hand area of the chamber 10 (drawing) so that air flows into this area of the chamber 10 and the connected flow channels 35 (outlet pipe 5, spray hose 4, outlet nozzle 3).

When the pressure in the water supply pipes 8 returns to its normal value, the closing part 19 of the closing flap 16 returns to its normal position, shown in Fig. 1 by solid lines, due to its characteristic elastic direction.

Fig. 3 shows another exemplary embodiment of an air valve, the structure of which is largely as described above. Corresponding structural elements are therefore denoted by the same reference numerals with the addition of 100.

The air valve 112 shown in Fig. 3 comprises an insert 113 which can be connected to the bottom part of the sanitary fitting using corresponding seals in the same way as in the case of the embodiment of Fig. 1. In this case, the air valve insert 113 of Fig. 3 has a duct 109 into which the mixing water leaving the control carton is led. The duct 109 terminates in the inner chamber 110 of the insert 113, to which a duct 111 and an air duct 114 also lead paraxially at an obtuse angle to the duct 109.

Further provided, a closure flap 116 is provided with a fastening -20 portion 119 and a closure portion 119. However, according to the different geometries of the channels 109. 114 in the insert 113, the closure flap 116 portions 118 and 119 are at an obtuse angle to each other. The transition area between the fastening part 118 and the closing part 119 again has a groove 120 which supports the hinge effect of this area.

25

The mode of operation of the air valve shown in Fig. 3 corresponds exactly to the mode of operation of the embodiment of Fig. 1, except that the turning range of the closure portion 119 is smaller in the example of Fig. 3 than in the example of Fig. 1.

30

In one exemplary embodiment not shown in the drawings, the closure portion of the closure flap is made of a hard material. It has an elastic surface on both sides which provides a seal against the mouth openings of the air duct and the inlet duct. Instead of these elastic surfaces, the orifices can also be surrounded by elastic seals. In both cases, only the hinge has to be elastic and / or flexible, in which case, by means of a corresponding spring device, care must be taken to ensure that the closing part is in the normal state next to the mouth of the air duct leading to the chamber.

Claims (4)

8 87248 An air valve for sanitary installations, intended in particular for installation in sanitary fittings, comprising: a) a housing (13); b) a chamber (10) in the housing, leading to: 10 ba) a water inlet channel (9); bb) a drainage channel (11); 15 bc) air duct (14); c) a shut-off flap (16) in the chamber which is rotatable by a certain angle due to the vacuum in the inlet duct (9) from a first position in which it closes the air duct (14) to a second position in which it closes the inlet duct (9) and opens the air duct (14) , characterized in that d) the closing flap (16; 116) is fastened to the housing (13; 113) with itself 25 by means of an integral elastic fastening part (18; 118); e) that the closing flap (19; 119) is pivotable about a transition line between the fastening part (18; 118) and itself; and 30 f) that the shut-off flap (19; 119) is formed so that when no vacuum is present in the inlet duct (9; 109), it remains elastically resilient over the mouth of the air duct (14; 114) leading to the chamber (10; 110). 35 Air valve according to Claim 1, characterized in that a groove (20; 120) is provided in the transition line between the fastening part (18; 118) and the pivoting shut-off flap (19; 119). Air valve according to Claim 1 or 2, characterized in that the shut-off flap (19; 119) is made of a hard material and is provided on both sides with an elastic surface. Air valve according to one of Claims 1 to 3, characterized in that the openings leading to the chamber (10; 110) of the air duct (14; 114) and the inlet duct (9; 109) are surrounded by elastic seals. 1 “87248